There's nothing inherently wrong with an opt-in coordination mechanism. It makes sense that if I trust someone to make a blacklist, I can have my node refer to

There's nothing inherently wrong with an opt-in coordination mechanism. It makes sense that if I trust someone to make a blacklist, I can have my node refer to that list. The problem is when an organization threatens you for "publishing" the wrong thing. That's a legal or social problem, not a technical one, and such organizations typically don't care in the slightest about how convenient it is for you to comply with their demands. If there's no blacklist mechanism, they're more than happy to demand that you shut down your node altogether.